<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
<div id="app">
    <form action="">
        <input type="text" v-model="message">
        {{message}}
    </form>
</div>
<script src="node_modules/vue/dist/vue.js"></script>
<script>
//    双向绑定 1.模板编译 2.数据劫持（观察数据变化） 3.Watcher
    let vm = new Vue({
        el: '#app',
        data: {
            message: 'hello zf'
        }
    })
</script>
</body>
</html>